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Breakthrough Listen's BLC1 signal ruled human radio interference

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Dynamic spectrum plot of the BLC1 narrowband radio signal
The BLC1 signal recorded at Parkes in 2019, later traced to human interference Shane Smith, Danny C. Price, Sofia Z. Sheikh, Daniel J. Czech, Steve Croft, David DeBoer,..., CC BY 4.0, via Wikimedia Commons

Two Nature Astronomy papers analyzed BLC1, a narrowband signal Breakthrough Listen recorded toward Proxima Centauri in April 2019 with Australia's Parkes telescope. The authors concluded it was not an alien technosignature but an artifact of local human-made radio interference.

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  1. OfficialAnalysis of the Breakthrough Listen signal of interest blc1 with a technosignature verification frameworkNature Astronomy / 2021-10-25
  2. OfficialA radio technosignature search towards Proxima Centauri resulting in a signal of interestNature Astronomy / 2021-10-25

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